-69.08% is the change from 828 to 256
Calculation steps:
[( 256 - 828 ) ÷ 828] x 100 = -69.08%
Formula
Percentage change = [(256 - 828) / 828] x 100
Subtract the new number by the original number
256 - 828 = -572
-572 ÷ 828 = -0.6908212560386473
-0.6908212560386473 x 100 = -69.08%